<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #box {
      widows: 70vw;
      height: 70vw;
      background: red;
    }
  </style>
</head>
<body>
  <div id="box"></div>
  <script>
    /*
      - changeTouches 触发当前事件的手指列表
      - targetTouches 当前元素上的手指列表
      - touches 当前屏幕中的手指列表
    */
    let box = document.getElementById('box');
    box.addEventListener("touchstart",function (){
      console.log("touchstart");
    })
    box.addEventListener("touchmove", function (){
      console.log("touchmove");
    })
    box.addEventListener("touchend",function (){
      console.log('touchend');      
    })
  </script>
</body>
</html>